Add block parameter to lilv_flock

1 files changed, 7 insertions, 3 deletions

diff --git a/src/filesystem.h b/src/filesystem.h
index 1b29d42..9cf6e4b 100644
--- a/src/filesystem.h
+++ b/src/filesystem.h
@@ -88,13 +88,17 @@ lilv_symlink(const char* oldpath, const char* newpath);
 /**
    Set or remove an advisory exclusive lock on `file`.
 
-   If the `lock` is true and the file is already locked, then this will not
-   succeed and non-zero will be returned.
+   If the `lock` is true and the file is already locked by another process, or
+   by this process via a different file handle, then this will not succeed and
+   non-zero will be returned.
 
+   @param file Handle for open file to lock.
+   @param lock True to set lock, false to release lock.
+   @param block If true, then this call will block until the lock is acquired.
    @return Zero on success.
 */
 int
-lilv_flock(FILE* file, bool lock);
+lilv_flock(FILE* file, bool lock, bool block);
 
 /**
    Visit every file in the directory at `path`.